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Even in the top journals the quality of diagnostic test accuracy studies in infectious diseases is medium Almeida LFM Saraiva JC Abreu MI Lima RFP [email protected] [email protected] [email protected] [email protected] Carvalho AEM Gomes DL Gonçalves JS João AR [email protected] [email protected] [email protected] [email protected] Barros MSP Monteiro SSO [email protected] [email protected] Adviser: Santos CMN, [email protected]. Class: 9 Abstract Introduction: Several studies report that the quality of diagnostic test accuracy studies is poor. In 2003, Standards for Reporting Diagnostic Accuracy (STARD) statement was published, giving a guideline to the structure of these studies. Aim: Evaluate the quality of diagnostic accuracy studies in infectious diseases in high impact factor journals, between 1995 and 2006. Methods: English-language papers on diagnostic accuracy studies in infectious diseases were found with an eligible query in MEDLINE. Articles were randomly selected and two independent reviewers agreed to include them on the study, in order to have 10 articles per year (95-06). Again two independent reviewers evaluate the quality of the studies using STARD checklist and summing the number of reported items. The evolution of the quality was evaluated by a Spearman correlation coefficient. Results: 111 articles were included. Mean STARD score was 15.5 (St. deviation, 3.65). The Spearman correlation coefficient is 0.2 (p = 0.036). 50% or more of the studies didn’t report 8 very important items. Discussion: The quality of reporting in infectious diseases diagnostic accuracy studies is medium, even in high impact factor journals. It is recommended to the authors, editors and reviewers to use the STARD checklist as well as a flow diagram. The reproducibility of the test should also be analysed. Key words: infection, diagnostic tests, sensitivity and specificity Introduction Over the past decade, awareness of the importance of the quality of reporting of research articles has increased. Several meta-analysis studies have emphasized the poor quality of research reports.[1] Key aspects of design and results, such as a patient flow and adverse events, are often lacking in primary research articles.[1-7] As if to get around this 1 issue, guidelines have been established in order to improve the reporting of diagnostic accuracy studies. The presentation of a flow diagram also improved the quality of reporting of randomised controlled trials.[8] In January 2003, guidelines for the reporting of studies on diagnostic accuracy (STARD statement) were published simultaneously in eight medical journals (Radiology, American Journal of Clinical Pathology, Annals of Internal Medicine, British Medical Journal, Clinical Biochemistry, Clinical Chemistry, Clinical Chemistry of Laboratory Medicine, and Lancet).[9,10,11] The STARD statement contains a checklist of 25 items and encourages the use of a flow diagram to represent the design of the study and the flow of patients through the study.[9,10] These items were identified by an extensive search in the literature by the STARD steering committee and subsequently reviewed during a two-day consensus meeting with researchers, editors, and members of professional organizations.[9,10] Since the publication, on January 2003, of the STARD checklist many quality studies on reporting diagnostic accuracy tests were made, as well as meta-analyses. Still, there weren’t at the present date any papers in medical literature about this on the subject of infectious diseases, so the main goal of this paper was doing an evaluation of the quality of reporting studies of diagnostic tests accuracy in infectious diseases literature published in high impact factor journals between 1995 and 2006 and see if there was any improvement after STARD publication (2003). Methods Data Sources In order to proceed with an evaluation of this sort in infectious diseases a systematic bibliographic review was carried on. Eligible papers for this study were acquired trough Medline, using a base query on Pub MED. This query states expressions that usually figure in diagnostic tests accuracy evaluations, based in a query proposed by Devillé et al [12], and other words related to infectious diseases’ theme (infectious diseases, infection, contamination, contagious). Then the query was limited to 13 journals with impact factor greater than five, 8 from a table regarding the “Top 50 Journals That Frequently Publish Articles on Diagnostic 2 Accuracy”[11] (see annex)- Circulation, Lancet, BMJ, New England Journal of Medicine, Archives of Internal Medicine, Annals of Internal Medicine, Gut, JAMA – and 5 from the table of highest impact factor journals in infectious diseases retrieved “ISI Web of Knowledge” (2005) - Emerging Infectious Diseases, Clinical Infectious Diseases, AIDS, The Lancet Infectious Diseases, Antiviral Therapy. The search was also limited to publications from 1995 to 2006. A random sample of studies was done in each year in order to include 10 articles per year in this study, so that the evolution of the quality of the diagnostic accuracy studies, the impact of STARD statement after its publication and the possible similarities between STARD items and pre-STARD studies could be analysed. Selection of Studies The data found was distributed among the ten reviewers. Each abstract was read by two reviewers. The two of them agreed that the paper should be introduced in the study and explained why. Disagreements were discussed and resolved, by this reviewers and a third one, in a consensus meeting. The papers should be included if they report an evaluation of the diagnostic tests accuracy in infectious diseases. They should be written in English. Data extraction The participant studies were assigned among ten reviewers. Every single paper was read by two different people as if to improve the reliability of the evaluation. A consensus evaluation was obtained by discussing and resolving disagreements between the two reviewers and a third one. Evaluation of the studies’ quality For evaluation of the studies quality the STARD checklist was used. The 25 items of this checklist are divided in 5 groups (Title/ Abstract/ keywords, Introduction, Methods, Results, Discussion) and some of them have subgroups that regard the important aspects that should be present in this kind of studies like the criteria of the study population choice 3 as well as the date and place of recruitment, the type of study, characteristics of the study population, statistical methods, how the test is evaluated, the clinical applicability, etc. A total STARD score for each paper was calculated by summing the number of reported items (0-25 points available; one point for each item). Higher scores indicated better quality of reporting. Statistical Analysis The reproducibility of this study was analysed, between the abstracts reviewers, by a proportion of agreement (PA) and a kappa statistics and, between the full texts reviewers, by an intraclass correlation coefficient (ICC) and a Bland and Altman limit. In order to assess the quality of all the participant studies, the reviewers used the 25 items of the STARD statement. After calculating the STARD score for each study, an average score per year was done. The normal distribution of the STARD items was checked with a histogram and a Kolmogorov- Smirnov test. Spearman correlation coefficient between STARD score and year was done, so that the evolution of the quality of diagnostic test accuracy studies could be analysed. Statistical analysis was performed by using SPSS for Windows 14.0. Results Studies’ inclusion With the mentioned base query at Pub MED 2128 papers were retrieved. The number of papers found per year is regarded in table 1. After the application of inclusion criteria in abstract review, 111 studies were selected (10 studies in each year, except 1996 – 6 studies and 1998 – 3 studies). The agreement between the reviewers was good (PA = 0.89; kappa statistic, 0.77). Studies’ analysis The mean of STARD score is 15.5 and the mean of this score per year is in table 1. Here the inter-reviewer agreement was also satisfactory (ICC, 0,92; Bland and Altman 4 limit, [-2.6, 2.9]). The distribution of STARD items is normal according KolmogorovSmirnov test (p = 0.0383). Table 1 - STARD score Papers Year of publication found N Mean Std. Deviation 1995 95 10 14.0 1.49 1996 92 8 13.8 2.49 1997 114 10 13.6 2.99 1998 104 3 15.7 3.51 1999 121 10 17.6 3.53 2000 96 10 17.4 4.81 2001 125 10 14.9 4.25 2002 132 10 14.0 3.06 2003 112 10 15.1 4.61 2004 161 10 18.0 2.00 2005 143 10 16.8 2.74 2006 138 10 14.7 4.17 Total 1433 111 15.5 3.65 Throughout the years the STARD score increased very slightly (Spearman correlation coefficient, 0.2; p = 0.036). However, the mean of STARD score in the post STARD triennial (04/06; mean, 16.5) is inferior to the triennial 98/00 (17.3), although it is greater than the triennials 01/03 (14.7) and 95/97 (13.8). Frequency of STARD items evaluation The graph in figure 1 shows the frequency of STARD items in the analysed studies. 50% of the studies or more didn’t report: the number, training and expertise of the persons executing and reading the index tests and the reference standard (item 10); whether or not the readers of the index tests and reference standard were blind to the results of the other 5 test and describe other clinical information available to the readers (item 11); methods for calculating test reproducibility (item 13); when study was done, including beginning and ending dates of recruitment (item 14); time interval from the index tests to the reference standard, and any treatment administered between (item 17); any adverse events from performing the index tests or the reference standard (item 20); how indeterminate results, missing responses, and outliers were handled (item 22); estimates of test reproducibility (item 24). The items 10,11,13,14 and 20 are the least present in all triennials analysed. Even though the item 16 (The number of participants satisfying the criteria for inclusion that did or did not undergo the index tests/or the reference standard; describe why participants failed to receive either test (a flow diagram is strongly recommended)) is present in 60,4% of the studies analysed, only 8 studies have a flow diagram. Discussion The results of this study indicate that the quality of diagnostic test accuracy studies between 1995 and 2006 is medium, even in journals with a high impact factor (mean, 15.5; std. deviation, 3.65). 6 Although the spearman correlation coefficient is positive (0.2, p=0.036), the quality of the studies throughout the years didn’t improve very much and consequences of STARD publication haven’t been seen yet. In fact, the quality of the studies in post-STARD triennial is inferior than in the triennial 1998/2000, in which STARD statement publication didn’t have influence. In this study, it was also verifiable that the majority of the studies analysed didn’t report some methods and results that are indispensable to the reader decide whether that is or isn’t a good diagnostic test. For a doctor who wants to know if a diagnostic test is efficient, it is extremely important that its diagnostic accuracy study is well reported, because if it isn’t how could the doctor believe in the contents of the study? In order to improve the quality of the reporting studies it is essential that the authors pay attention to the STARD checklist, specially to those items which have been poorly reported, such as the number of the persons executing the tests, if the readers are or aren’t blind to the results, date and place of population recruitment, population characteristics, adverse events and indeterminate results and how they were handled. All the STARD items are important, but a large number of studies lacked those described above. There are other two items that frequently were not reported in the studies – the items about the reproducibility of the test (items 13 and 24). These two items are facultative in the STARD checklist, however we think that they shouldn’t be, because if agreement among the raters is good the test could be good as well, on the other hand if the their agreement is poor, the usefulness of the test is limited [16]. As it was referred in the results, the number of participants satisfying the inclusion criteria that did or didn’t undergo the index tests or the reference standard wasn’t the least reported item, but the use of a flow diagram is rare, which is something that needs to be improved, because a flow diagram turns this explanation more simple and pleasant for the reader. The STARD guidelines are not the first to focus on the reporting of studies. CONSORT, QUORUM, and MOOSE have emphasized the importance of better reporting of other study designs [11-15] , so that authors should pay attention to these guidelines, in order to improve the report of their studies. 7 The STARD statement focuses on the quality of reporting, not the methodological quality of the diagnostic study. For example, if the authors reported that the readers of the index tests and reference standard were not blind to other results, the item 11 is well reported, although it is methodological incorrect. Nevertheless, the quality of reporting a study may be associated to the quality of this study methods. It is easier to report on a wellperformed study than on a study that was poorly design or in which a large number of deviations occurred. Moreover, in the latter case, the authors may be less inclined to report in detail what happened. Increase attention to the quality of reporting and strict requirements for reporting in journals might, in the long term, thus also improve the quality of diagnostic research [11]. Although other studies about the quality of reporting in diagnostic test accuracy have been published, this one is the first on the subject of infectious diseases. This study has a fewer limitations, because the query used to search in MEDLINE may have missed some studies, even though a random sample was used. In years 1996 and 1998, only six and three articles, respectively, were included what could be a deviation because they were compared with years with 10 studies each. However, all the abstracts of those years found with the query were read and only this limited number of studies could be included. Finally it is strongly recommended that authors, editors and reviewers use the STARD checklist to write and review a diagnostic accuracy studies and, even though it is facultative in this checklist, the reproducibility of the test should be reported as well as the use of a flow diagram. Hopefully this will lead to an improvement of reporting in the future and, in a longer term, to better diagnostic tests. References 1. Smidt N, Rutjes AWS, Van der Windt AWM, Ostelo RWJG, Reitsma JB, Bossuyt PM, Bouter LM, De Vet HCW: Reproducibility of the STARD checklist: an instrument to assess the quality of reporting of diagnostic accuracy studies. BMC Medical Research Methodology 2006, 6:12. 8 2. Chan AW, Altman DG: Epidemiology and reporting of randomized trials published in PubMed Journals. Lancet 2005, 365:1159-1162. 3. Honest H, Khan KS: Reporting of measures of accuracy in systematic reviews of diagnostic literature. BMC Health Serv Res 2002, 2(1):4. 4. Pocock SJ, Collier TJ, Dandreo KJ, De Stavola BL, Goldman MB, Kalish LA, Kasten LE, McCormack VA: Issues in the reporting of epidemiological studies: a survey of recent practice. British Medical Journal 2004, 329:883. 5. Ernst E, Pittler MH: Assessment of therapeutic safety in systematic reviews: literature review. British Medical Journal 2001, 323:546. 6. Ioannidis JPA, Lau J: Completeness of safety reporting in randomized trials. An evaluation of 7 medical areas. Journal of the American Medical Association 2001, 285:437-443. 7. S. Tooth L, Ware R, Purdie DM, Dobson A: Quality of reporting of observational longitudinal research. American Journal of Epidemiology 2005, 161:280-288. 8. Mills E, Wu P, Gagnier J, Heels-Ansdell D, Montori VM: An analysis of general medical journals that endorse CONSORT found that reporting was not enforced consistently. Journal of Clinical Epidemiology 2005, 58:662-667. 9. Bossuyt PM, Reitsma JB, Bruns DE, Gatsonis CA, Glasziou PP, Irwig LM, Moher D, Rennie D, de Vet HC, Lijmer JG: The STARD statement for reporting studies of diagnostic accuracy: explanation and elaboration. Clinical Chemistry 2003, 49:7-18. 10. Bossuyt PM, Reitsma JB, Bruns DE, Gatsonis CA, Glasziou PP, Irwig LM, Lijmer JG, Moher D, Rennie D, de Vet HC: Towards complete and accurate reporting of studies of diagnostic accuracy, the STARD initiative. Clinical Chemistry 2003, 49:16. 11. Smidt N, Rutjes AWS, Van der Windt AWM, Ostelo RWJG, Reitsma JB, Bossuyt PM, Bouter LM, De Vet HCW: Quality of reporting of diagnostic accuracy studies. Radiology 2005, 235:347-353. 12. Devillé WL, Buntinx F et al. Conducting systematic reviews of diagnostic studies: didactic guidelines. BMC Medical Research Methodology 2002, 2:9 13. Altman DG. Better reporting of randomised conrolled trials: the CONSORT statement. BMJ 1996. 313: 570-571 9 14. Moher D, Cook DJ, Eastwood S et al, for the QUORUM group. Improving the quality of reports of meta-analyses of randomised controlled trials: the QUORUM statement. Lancet, 1999. 354: 1896-1900. 15. Struop DF, Berlin JA, Morton SC, et al. Meta-analysis of observational studies in epidemiology : a proposal for reporting. JAMA 2000, 283:2008-2012 16. Fleiss JL, Levi B, Paik MC. The Measurement of Interrater Agreement. In: Fleiss JL, Levin B, Paik MC. Statistical Methods for Rates and Proportions. (cidade) Jonh Wiley and Son, Inc; 2003. p.598 Annex 1. Query used on Pubmed: (((((((("sensitivity and specificity"[All Fields] OR "sensitivity and specificity/standards"[All Fields]) OR "specificity"[All Fields]) OR "screening"[All Fields]) OR "false positive"[All Fields]) OR "false negative"[All Fields]) OR "accuracy"[All Fields]) OR (((("predictive value"[All Fields] OR "predictive value of tests"[All Fields]) OR "predictive value of tests/standards"[All Fields]) OR "predictive values"[All Fields]) OR "predictive values of tests"[All Fields])) OR (("reference value"[All Fields] OR "reference values"[All Fields]) OR "reference values/standards"[All Fields]) OR ((((((((((("roc"[All Fields] OR "roc analyses"[All Fields]) OR "roc analysis"[All Fields]) OR "roc and"[All Fields]) OR "roc area"[All Fields]) OR "roc auc"[All Fields]) OR "roc characteristics"[All Fields]) OR "roc curve"[All Fields]) OR "roc curve method"[All Fields]) OR "roc curves"[All Fields]) OR "roc estimated"[All Fields]) OR "roc evaluation"[All Fields]) OR ("likelihood ratio"[All Fields])) AND ((( “infectious diseases”[All Fields] OR “infection”[All Fields] OR “contagious”[All Fields] OR “contamination”[All Fields]) AND ("Circulation"[Jour] OR Lancet[Jour] OR "BMJ"[Jour] OR "The New England journal of medicine"[Jour] OR "Archives of internal medicine"[Jour] OR "Annals of internal medicine"[Jour] OR "Gut"[Jour] OR "JAMA : the journal of the American Medical Association"[Jour])) OR ("The Lancet infectious diseases"[Jour] OR "Clinical infectious diseases : an official publication of the Infectious Diseases Society of America"[Jour] OR "AIDS"[Jour] OR "Emerging infectious diseases"[Jour] OR "Antiviral therapy"[Jour])) NOT (review[Publication Type] OR letter[Publication Type]) 10 2. 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